Function setValidateArgs

cmd/docker/docker.go:295–320

The Args is handled by ValidateArgs in cobra, which does not allows a pre-hook. As a result, here we replace the existing Args validation func to a wrapper, where the wrapper will check to see if the feature is supported or not. The Args validation error will only be returned if the feature is suppo

(dockerCLI versionDetails)

// where the wrapper will check to see if the feature is supported or not.
// The Args validation error will only be returned if the feature is supported.
func setValidateArgs(dockerCLI versionDetails) func(*cobra.Command) {
	return func(ccmd *cobra.Command) {
		// if there is no tags for a command or any of its parent,
		// there is no need to wrap the Args validation.
		//
		// FIXME(thaJeztah): can we memoize properties of the parent?
		//  visitAll traverses root -> all childcommands, and hasTags
		//  goes the reverse (cmd -> visit all parents), so we may
		//  end traversing two directions.
		if !hasTags(ccmd) {
			return
		}

		if ccmd.Args == nil {
			return
		}

		cmdArgs := ccmd.Args
		ccmd.Args = func(cmd *cobra.Command, args []string) error {
			if err := isSupported(cmd, dockerCLI); err != nil {
				return err
			}
			return cmdArgs(cmd, args)
		}
	}
}

func tryPluginRun(ctx context.Context, dockerCli command.Cli, cmd *cobra.Command, subcommand string, envs []string) error {
	plugincmd, err := pluginmanager.PluginRunCommand(dockerCli, subcommand, cmd)